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FT-IR Spectrum (KBr disc)

does anyone know of any good websites that show you how to interpret the spectrum of the above?
I cant find any really...
:eek:
As KBr is IR inactive it won't effect the spectrum - it's just a normal IR spectrum :smile:

Here is a basic list of the frequencies/functional groups.
Reply 2
Avatar for kerry3788
kerry3788
OP
thanks
im avin rite fun n games with this...
im currently tryin 2 identify mass spectrum peaks.
any ideas as to what the following peaks could be?
45m/z
64
66
81
109
120
138
141?
im avin 2 do mass spec, ir, 13c 1h etc... im goin mad
:woo:
Reply 3
Avatar for Kyle_S-C
Kyle_S-C
12
What's the compound meant to be? Or don't you know?
Reply 4
Avatar for kerry3788
kerry3788
OP
the formula for the compund is C6 H4 OH COOH. Is that salicyclic acid or something?
Reply 5
Avatar for shengoc
shengoc
12
Definitely a phenol with a carboxylic acid. It could most likely be salicylic acid where the OH and COOH are ortho to each other. But you can't know this for sure from mass spec or IR alone - have to use NMR.
Reply 6
Avatar for kerry3788
kerry3788
OP
its the mass spec im struglin wiv realy. cant say i like analysin all the sticks! lol
kerry3788
its the mass spec im struglin wiv realy. cant say i like analysin all the sticks! lol


138 is the molecular ion so the peak at 141 must be due to isotopes (maybe 18O, and/or 13C etc)

Look at the m/e 45

now count up [COOH]+

coincidence?

Maybe you can take it from there... :smile:
Reply 8
Avatar for kerry3788
kerry3788
OP
i thought th 81 may be hbr or something, 45 = cooh , but theres all the rest, and i dont get it.... considering weve been given the formula (which i thouhgt was salicyclic acid), do all the peaks need analysin, if so, what r they? im sooo confused...

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